Javascript bug in i.e function returning NAN (works in other browsers) -

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hello have created javascript function recaculates grand total of order when delivery method changed. code works fine in firefox, chrome , i.e 9 returns nan in i.e 8 , 7, understand means not number.

i have tried using parseint, paresefloat , number can't understand why not work in i.e 6, 7 or 8

my code follows 

<script type="text/javascript"> function changeprice(a) {     // grabs delivery price of selected option i.e 10.99     var price = parsefloat(a);      // grab delivery price on screen i.e 4.99     old_price = document.getelementbyid('delivery-sidebar').innerhtml;     // removing span tags around function not needed     old_price = old_price.replace('<span class=price>','');     old_price = old_price.replace('</span>','');       //grab subtotal price (which not include delivery) on screen  i.e 34.99         var subtotal = document.getelementbyid('overall').innerhtml;      // removing span tags around function not needed     subtotal = subtotal.replace('<span class="price">','');     subtotal = subtotal.replace('</span>','');     subtotal = subtotal.replace('£','');      // converting subtotal float      subtotal=parsefloat(subtotal);      // if price of delivery not match price on screen     if (price != old_price)         {       //add new price against subtotal        var overall_total = (parsefloat(subtotal))+(parsefloat(price));             // round result 2 decimal places i.e 10.99             overall_total=roundnumber(overall_total,2);             // update values on screen              document.getelementbyid('delivery-sidebar').innerhtml = '<span class="price">£'+price.tofixed(2)+'</span>';             document.getelementbyid('grand-price').innerhtml = '<span class="price">£'+overall_total.tofixed(2)+'</span>';         } } function roundnumber(num, dec) { var result = math.round(num*math.pow(10,dec))/math.pow(10,dec); return result; }  </script>

and markup 

    <ul>       <li>          <input name="shipping_method" value="tablerate_bestway" id="s_method_tablerate_bestway" checked="checked" class="radio validation-passed" onclick="changeprice('0')" type="radio">  <label for="s_method_tablerate_bestway">uk delivery (3 - 7 working days) </label>          <span class="price">free delivery</span>                                                      </li>     </ul>     <dd>       <ul>           <li>             <input name="shipping_method" value="flatrate_flatrate" id="s_method_flatrate_flatrate" class="radio validation-passed" onclick="changeprice('10')" type="radio">              <label for="s_method_flatrate_flatrate">next day - orders before 2pm </label>              <span class="price"><span class="price">£10.00</span></span>                                                              </li>      </ul>    </dd>

you can never rely on reading same html page created with.

if read <span class="price"> in ie <span class=price> (sans ") replace fails , parse numeric returns nan.

you can either choose rely on .replace('<span class=price>','i') or better give span id: <span id="totalprice" class="price">£xxx</span> , numeric value innerhtml, or better retain numeric values in memory in first place.


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